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供人员安全疏散用的楼梯间和室外楼梯的出入口或直通室内外安全区域的出口。即通向安全区域的出口。室内安全区域包括符合规范规定的避难层、避难走道等,室外安全区域包括室外地面,符合疏散要求并具有直接到达地面设施的上人屋面、平台以及符合规范要求的天桥、连廊等。
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iron
iron and steel analysis
Iron and steel E-commerce
iron and steel making
iron and steel scrap
Iron Axle-bearings from Mianchi
iron bacteria
iron-based cast and wrought superalloy
iron based cast superalloy
iron based catalyst
Iron based powder metallurgy material with high density
iron based superconductor
iron-based superconductor
iron bath gas making
iron binding globulin
iron bird test of flight control system
iron bridge
Ironbridge Gorge
Iron Cannons of the Hongwu Reign,Ming Dynasty
iron carbide
iron-carbon phase diagram
iron carbonyl
Iron Casting Site at Zhaoxiancun
Iron-casting Workshop of Han Dynasty at Taicheng
iron chloride
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